I think the owner needs to assess the situation and then decide if a vet is needed. It's no different from having a kid that wakes up with a runny nose -- is it allergies? a cold? strep throat? pneumonia? In the absence of symptoms that say otherwise, you wait a while and see what happens. If the kid gets sicker, you take them to the doctor. If not, not.
In the OP's case, the pig's stomach was full after eating breakfast. It was feeling fine, acting normal, and had no other symptoms whatsoever of bloat. I don't know about you, but I'm not spending money on a vet visit that isn't necessary, and it certainly wasn't going to hurt the pig to wait a few hours and see if its stomach goes down. If not, she should go to the vet.
Couchon, you have a very sick pig that has given you no end of headaches and worry in trying to manage the illnesses. You see every other pig's symptoms through that filter. But the vast majority of pigs don't have the same kind of problems that your pig does, and it's not particularly helpful to recommend that they go to the vet at the first possible inkling that something might be wrong. Most people can't afford vet visits that often, and if they repeatedly take in a pig that really has nothing wrong with it, they're apt to be put in the crying "wolf" category and not taken seriously when something really is wrong.
I think it's far more responsible to try to teach people how to evaluate the symptoms and decide which ones need immediate treatment and which ones can possibly wait to see if they improve. Not all symptoms, even of intestinal problems, need immediate vet visits.